[SATLUG] Netmask /32 - is it usable?

Bruce Dubbs bruce.dubbs at gmail.com
Sat Jun 2 11:09:06 CDT 2012


Don Wright wrote:
> The question came up on a Debian list about supporting the /32 netmask
> (255.255.255.255). I can't see any way to run a TCP session on such a network,
> but since the list has been quiet, I'll throw it out for discussion.
> 
> Is there any practical use for an interface that can't talk to anyone else? Or
> is there a pathway I'm not seeing?  --Don

It could be useful in a routing table:

Destination  Gateway      Genmask         Flags Metric Ref    Use Iface
1.2.3.4      0.0.0.0      255.255.255.255 U     0      0        0 eth1
192.168.0.0  0.0.0.0      255.255.255.0   U     0      0        0 eth0
0.0.0.0      192.168.0.1  0.0.0.0         UG    0      0        0 eth0

The destination could do the same in reverse, so the conversation would 
only be between those two systems.

   -- Bruce


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